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The horizontal fraction bar was introduced by the Arabs.

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There are more sensory neurons in the tongue than in any other part of the body.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

Metabolic rates of animals that differ in size. Metabolic rates of animals that differ in size.
Interaction web of factors that might influence locust population size. Interaction web of factors that might influence locust population size.
Sun size comparison Sun size comparison
Nephroblastoma. A sectioned kidney reveals the presence of a very large tumor, which arose from feta Nephroblastoma. A sectioned kidney reveals the presence of a very large tumor, which arose from feta
Hominid Brain Size Hominid Brain Size
Contrasting eukaryotic and prokaryotic cells in size and complexity Contrasting eukaryotic and prokaryotic cells in size and complexity
Video: Stroke volume - contractility definition

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